A New Method for Determining Coupling Loss Factors for Sea

Manik, Dhanesh N.

doi:10.1006/jsvi.1997.1313

Cited by 15 publications

(7 citation statements)

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“…ESEA Method Application. Classic SEA requires PIM to input power load into the structure to obtain system loss factor [20][21][22]. However, due to physical constraints, it is difficult to perform such a measurement.…”

Section: Esea Methodsmentioning

confidence: 99%

“…e main calculation methods include in nite system impedance, analytic derivation method, power input method (PIM), empirical formula method, SEA numerical simulation method, and two-mode method [18]. e analytical calculation expression of CLF at point, line, and surface structural connections is given in [20][21][22] is one of the e ective methods to determine the CLF. By measuring input power and average response energy of the system, as shown in Figures 3 and 4, it solves the energy balance equation to obtain the average loss factor of the frequency band.…”

Section: Expression Of Coupling Loss Factor (Clf)mentioning

confidence: 99%

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Research Progress on High‐Intermediate Frequency Extension Methods of SEA

Zheng

Deng

et al. 2019

Shock and Vibration

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Statistical energy analysis (SEA) can accurately describe the average vibration characteristics through system energy flow and transmission feedback. It is a powerful tool to solve the problem of high-frequency acoustics-vibration. SEA is widely used in vehicles, ships, aviation, and other transportation engineering fields. However, the expansion of SEA, based on the assumption of modal equipartition and weak coupling, is limited to the intermediate frequency. Although the SEA basic theory can be extended by relaxing the hypothesis conditions or the analysis of the medium-frequency acoustics-vibration can be carried out using the finite element method (FEM) and SEA mixing method, there are still many challenges associated with these options. To improve the basic theory of SEA and knowledge of intermediate frequency extension methods, as well as attract the attention of domestic scholars, this paper describes classical SEA and intermediate frequency extension methods. First, coupling loss factor (CLF) error propagation and parameter acquisition in classical SEA are introduced, and the three relative error calculation methods of CLF are compared. Then, the method of obtaining parameters is described from three aspects of energy transfer, input load, and modal density. Second, SEA intermediate frequency extension technology (experimental statistical energy analysis (ESEA), finite element statistical energy analysis (FE-SEA), statistical modal energy distribution analysis (SMEDA), and waveguide analysis (WGA)) are introduced. Neutron structure assembly and modeling, interval and mixed interval analysis, interval variable and mixed interval variable response are also described, so as to justify the development of a hybrid, large-scale interval algorithm. Finally, the engineering application of the above method is introduced, the limitations and shortcomings of SEA and intermediate frequency extension methods are reviewed, and unsolved problems are further discussed.

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Section: Esea Methodsmentioning

confidence: 99%

Section: Expression Of Coupling Loss Factor (Clf)mentioning

confidence: 99%

Research Progress on High‐Intermediate Frequency Extension Methods of SEA

Zheng

Deng

et al. 2019

Shock and Vibration

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“…Clarkson and Ranky 12 measured the dissipation loss factor and CLF of two plates at individual level and connected to each other, respectively. Manik 13 presented the drawbacks for determining CLF of currently available methods. A new numerical method has been suggested by him for determining CLFs.…”

Section: Introductionmentioning

confidence: 99%

Estimation of coupling loss factors for rectangular plates with different materials and junctions

Bhagwan

Popuri

2019

Noise & Vibration Worldwide

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In statistical energy analysis, coupling loss factor is the essential parameter for vibro-acoustic analysis of complicated structures. The coupling loss factors have been estimated using energy-level difference method. The tightening torque applied at structural junction has been varied. Higher values of coupling loss factor have been observed for higher tightening torque on bolted junction. The coupling loss factors have been determined for various structural junctions of rectangular composite plates. The riveted and bolted junctions have been examined for composite plates in same plane and size. The coupling loss factors for bolted junction are relatively higher than that for riveted junction of composite plates. The values of coupling loss factors are found to increase with increasing tightening torque applied at structural junctions of composite plates. It is also noted that the experimental results of coupling loss factors for point junctions vary with changes in fiber orientations of composite plates. It is firmly believed that the various findings of the coupling loss factors in this article help for vibro-acoustic analysis of complicated structures.

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“…On the contrary, for many real systems there are not theoretical relationships allowing to predict correctly the CLFs and ILFs. Therefore all the SEA parameters (CLFs and ILFs) must be experimentally determined [8][9][10][11] or calculated numerically by appropriate techniques [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%